Grinding machine for injection needles



mm mm WM" H. ENYA GRINDING MACHINE FOR INJECTION NEEDLES Film June 23, 1939 3 Sheets-Sheet 2 STLVETL i'ol" 194. H. ENYA 2,211,752

GRINDING MACHINE FOR INJECTION NEEDLES Film Jum 23, 1939 3 Sheets-Sheet 3 Unve. )-L *0 r films/giro [111 ,90

Patented Sept. 24, 1940 PATENT OFFICE GRINDING MACHINE FOR INJECTION NEEDLES Hachiro Enya, Tokyo, Japan Application June 23, 1929, Serial No. 280,879

In Japan November 26, 1938 4 Claims.

My invention relates to improvements in a grinding machine for injection needles, and its object is to provide a simple and effective machine for grinding injection needles facilitating repeated use thereof.

Another object of my invention is to provide a device for automatically lubricating the grindstones and for correcting the Working surface of the grindstone smoothly.

Injection needles have usually been abandoned after use of several times as the point becomes dull and it is difficult to re-grind the point to the normal condition by simple and ordinary means.

In accordance with my invention a simple grinding machine is produced for facilitating the re-grinding of an injection needle by very simple and easy operation quickly by any body to the requiredsharpened point and .is characterized in that three sets of grindstones are mounted on the same shaft and the needle holder is arranged opposite to the grindstones and its angular position can be changed in a vertical plane on a pivotal axis and also swinged horizontally to give a suitable twist to the needle axis.

My invention will be better understood from the following description when considered in connection with the accompanying drawings, and its scope will be pointed out in the appended claims. 7 In the accompanying drawings, Fig. 1 is an elevation of a grinding machine of injection needles embodying my invention; Fig. 2 is a side elevation partially in section; Fig. 3 is its plan view; Fig. 4 is an end view of a part of Fig. 1; Fig. 5 is an upward plan view of the needle holder and its operating member; Fig. 6 is its side view; Fig. 7 is a sectional view of the grindstones; Fig. 8 is an explanatory drawing of the grinding operation and Figs. 9-A and B are an elevation and a side view of a needle tip respectively in an enlarged scale.

Referring to the drawings, l represents a machine base; 2 designates the supporting frame; 3 represents a pillar to which a combined needle holder andoperating stock is mounted. 4 represents a main grindstone; 5 and 6 are sub-grindstones which are mounted on a shaft 9 at a spaced relation by means of distance pieces 1 and 8. ill represents a pulley secured to one end of the shaft 9 adapted to be driven by a transmission belt l3 from a driving pulley l2 mounted on the shaft ll. l4 is a handle though a motor may be used to drive the pulley l2.

l5 represents a holder of an injection needle l6 and has a projected axis H, by which the holder is supported on an operating stock [8 and is clamped by a nut 20 through a spring IS in such manner that the holder l5 may be turned on the supporting axis I! for a certain angle. The operating stock It is provided with a. handle 2| and is secured to the member 22 by means of a screw 23 to be rotated about the axis 23 while the member 22 is pivoted at 24 to a vertical axis 25 put in the pillar 3. The member 22 has a rod 26 projected to one side which is extended between the projections or recesses 21 below the 10 needle holder I5. 28 are stops projecting downwardly from the operating stock [8 serving to limit the right and left ranges of turning of the stock I8 by engaging the rod 28'.

A spindle Z9 is loosely mounted across the supporting frames 2 and has secured thereto an arm 30 which is provided with a needle press 3! on one end. The needle press 3! consists of a piece of fiber or other suitable material put in the casing and secured thereto by means of a' screw 32 adjustably. 0n the opposite end of the arm 30 is formed a grindstone dresser 33 having a small finishing grindstone 34 secured by a screw 35 therein and an oil reservoir 36 is formed on the dresser 33. 31 represents a strip of leather serving to feed oil. An operating rod 38 is fixed to the spindle 29 and a spring 40 is connected between the arm 39 and the post 4|.

The attachment of grindstones 4, 5 and 6 is shown in Fig. 7, wherein 42 is a tube put on the shaft 9 and passing through the grindstones 4, 5 and 6 as well as distance pieces 1 and 8 which are clamped together by means of a nut 43 and secured to the shaft 9 by a set screw 44. 45 is a collar secured to the shaft 9 by means of a set screw 46 serving to prevent the side play of the shaft.

The operation of the grinding machine of this invention is as follows: A needle I6 is inserted through a hole of the needle holder [5 and clamped by a set screw 42 after the needle point has been adjusted suitably corresponding to the length of needle. Then the needle tip is brought to touch on the surface of the main grindingstone 4 by the handle 2| and the pressing piece 3| is brought on the needle tip by shifting the arm 38 which is biased by the spring 40 with suitable pressure. Then the pulley I2 is turned by the handle M to drive the pulley l0 and the grindstones. In thisrnanner the needle tip is ground somewhat concave as shown by a in Fig. 9-A which is most important for the injection needle. Next the needle pressing piece 3| is lifted by turning the handle 38 and the handle 2| is moved horizontally to swing the operating member i8 55 to one side around the pivot 23, then the needle holder I5 is turned slightly about its axis [1 by the engagement of the rod 26 and projections 21 and thus the tip of the needle l6 is brought to make contact on the side surface of the grindstones 5 or 5 at a slightly twisted condition as shown in Fig. 8. The movement of operating member i8 is limited by the stop 28 and the rod 26 so as not to be turned excessively and occupies a condition as shown in Fig. 8. At such condition the pulley I2 is turned to rotate the grindstones to finish one side edge b of the needle tip. Then the handle 2! is shifted to the opposite position and similar operation is repeated to grind the other side edge I) of the needle tip. To grind both side edges of the needle tip at a certain angle is very important to improve the penetration of needle or cutting ability in order not to give pain to the patient.

During the above operations the dresser 34 is pressed on the main grindstone by turning the handle 38, then the surface of grindstone 4 can be smoothly finished with oil fed on its surface from thin strip 31 of leather. Thus by shifting the handle 38 the pressing arm 30 secured to the spindle 29 can be turned from the dressing operation to the needle press very easily.

With the attachment of grindstones as shown in Fig. '7, the grindstones 4, 5 and 6 can be taken out by loosening the set screw 46 and pulling out the shaft 9 together with the pulley If] without disassembling the machine frames. Since the grindstones are assembled together on a tube 9 independently the distances between the pairs of grindstones 5 and 6 can be easily adjusted as desired by interchanging the distance pieces I and 8 by simply loosening the nut 43 so that the grindstones can be easily put on or disassembled and easily adjusted. If the distance pieces are distinguished by different colours for different dimensions the distance pieces can be easily replaced corresponding to the different sizes of the needle 16.

I claim:

1. A grinding machine for injection needles, comprising grinding element consisting of a main grindstone and two associated grindstones arranged to the left and right of said main grindstone and spaced therefrom by definite disstances, said grindstones being fixed to a shaft rotatably mounted on the machine frame, a needle supporting and operating member mounted on a pillar at a position opposite to the main grindstone, a needle holder carried by said member, said needle operating member being constructed and arranged to be swung forward and from the main grindstone and also to be turned. to the right and left to any angular position to thereby turn the needle holder by an amount corresponding to the turning of the operating member to thereby move the needle tip through a certain angle so as to bring the needle tip on the side surface of one or the other of said associated grindstones, and a needle pressing member secured to an arm projecting from a spindle rotatably mounted on the machine frame and adapted to press the needle tip on the surface of the main grindstone.

2. A grinding machine for injection needles, comprising a main and two associated grindstones adjustably assembled on a tube which is sleeved on and secured to a grindstone shaft which is rotatably mounted on the machine frame, means for driving said grindstone shaft, a needle pressing piece mounted on one end of an arm secured to a spindle rotatably mounted on the machine frame and operable by a spring to a biased position, a grindstone dresser attached to the opposite end of said arm, a device for feeding oil to the dresser, an operating member pivoted on a supporting pillar to swing toward and from the main grindstone, a needle holder mounted on said operating member on a horizontal axis, and engaging means between said needle holder and said operating member to turn the needle holder to a right or left position when the operating member is swung to the right or left.

3. A machine for grinding injection needles, comprising three grindstones mounted on the same shaft and spaced along said shaft by definite distances, a supporting device mounted adjacent and opposite the central grindstone on horizontal and vertical pivots, whereby it may be moved both parallel and transversely to the central grindstone, and a needle holder carried by said supporting device and movable therewith to cause a needle carried thereby to be moved into engagement with the central grindstone or with either of the other grindstones.

4. A machine according to claim 3, in which the needle holder is movably connected to the supporting device and is constantly urged toward the supporting device by spring means.

HACHIRO ENYA. 

